Physics, asked by abdus30311, 4 days ago

điều nào sau đây sai khi nói đến nội nặng của khí lý tưởng

Answers

Answered by patelpriya5402
0

Explanation:

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Class 9

>>Maths

>>Heron's Formula

>>Area of Quadrilateral

>>A field is in the shape of a trapezium w

Question

A field is in the shape of a trapezium whose parallel sides are 25 m and 10 m. The non-parallel sides are 14 m and 13 m. Find the area of the field.

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Solution

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Construction: 

⇒Draw BE∥AD such that D−E−C

⇒Draw BM⊥DC such that D−E−M−C

□ABED is parallelogram,

⇒AD=BE=13  m

⇒AB=DE=10  m

⇒BC=14  m

⇒DC=DE+EC   ....(∵D−E−C)

∴EC=25−10

∴EC=15  m

⇒In ΔBEC

⇒2S=13+14+15

⇒S=21  m

⇒Area of △BEC

⇒A=s(s−a)(s−b)(s−c)  

=21(21−13)(21−14)(21−15)

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